Improving Room Temperature-Stretch Formability of Magnesium Alloys by Laser Shock Peening

2019 ◽  
Author(s):  
Bo Mao ◽  
Xing Zhang ◽  
Yiliang Liao ◽  
Bin Li
Keyword(s):  
Grain Refinement ◽  
Room Temperature ◽  
Surface Hardness ◽  
Mg Alloys ◽  
Laser Shock Peening ◽  
Laser Shock ◽  
Electron Backscattered Diffraction ◽  
Stretch Formability ◽  
Shock Peening ◽  
Refinement Effect

Abstract The applications of magnesium (Mg) and their alloys are often restricted by their poor formability at room temperature. Several strategies have been developed in recent years to enhance the formability of Mg alloys, such as grain refinement and texture weakening, either by alloying or processing. Laser shock peening (LSP) is an advanced laser-based surface processing method which has been utilized improve the surface hardness, fatigue performance, and corrosion resistance of Mg alloys. Recent studies show that LSP can bring significant texture weakening and grain refinement effect in Mg alloy, indicating its potential capability of enhancing the formability of Mg alloys. This research is to explore the applicability of LSP to improve the room temperature-stretch formability of Mg alloys. LSP experiments are carried out on an AZ31B Mg alloys. The microstructure before and after LSP are characterized by optical microscopy (OM) and electron backscattered diffraction (EBSD) microscopy. Erichsen tests are carried out to evaluate the stretch formability of Mg alloys. The results show that LSP can bring texture weakening and grain refinement effect simultaneously, resulting in the improved room temperature-stretch formability of Mg alloys.

Dislocation density-based study of grain refinement induced by laser shock peening

2020 ◽  
Vol 121 ◽  
pp. 105827 ◽  
Author(s):  
Cheng Wang ◽  
Long Wang ◽  
Chuan-Li Wang ◽  
Kun Li ◽  
Xiao-Gui Wang
Keyword(s):  
Dislocation Density ◽  
Grain Refinement ◽  
Laser Shock Peening ◽  
Laser Shock ◽  
Shock Peening

Twinning Behavior in Magnesium Alloys Processed by Laser Shock Peening

2019 ◽  
Author(s):  
Bo Mao ◽  
Yiliang Liao ◽  
Bin Li
Keyword(s):  
Mechanical Properties ◽  
Magnesium Alloys ◽  
Microstructure Evolution ◽  
Laser Intensity ◽  
Deformation Twinning ◽  
Mg Alloys ◽  
Laser Shock Peening ◽  
Surface Microstructure ◽  
Laser Shock ◽  
Shock Peening

Abstract In this paper, the surface microstructure evolution of an AZ31B magnesium (Mg) alloy during laser shock peening (LSP) was investigated. Particular attention was paid to the deformation twinning behavior, which plays an important role in the mechanical properties of Mg alloys. The effect of laser intensity on the twinning distribution was investigated. Twin-twin interactions during LSP process were characterized. The mechanism responsible for the formation of gradient twinning microstructure and twinning-induced hardening effect were discussed.

Effect of laser shock peening and heat‑treated on surface hardness of Ti–6Al–4V

2021 ◽  
Author(s):  
Liming Yuan ◽  
Wentai Ouyang ◽  
Xiu Qin ◽  
Wenwu Zhang ◽  
Pengkai Liu ◽  
...  
Keyword(s):  
Surface Hardness ◽  
Laser Shock Peening ◽  
Laser Shock ◽  
Heat Treated ◽  
Shock Peening

scholarly journals Impact on Mechanical Properties and Microstructural Response of Nickel-Based Superalloy GH4169 Subjected to Warm Laser Shock Peening

Materials ◽  
2020 ◽  
Vol 13 (22) ◽  
pp. 5172
Author(s):  
Ying Lu ◽  
Yuling Yang ◽  
Jibin Zhao ◽  
Yuqi Yang ◽  
Hongchao Qiao ◽  
...  
Keyword(s):  
Surface Treatment ◽  
Compressive Stress ◽  
Surface Hardness ◽  
Residual Compressive Stress ◽  
Laser Shock Peening ◽  
Effect Of Temperature ◽  
Laser Shock ◽  
Treatment Technology ◽  
Shock Peening ◽  
Gh4169 Alloy

Laser shock peening (LSP), as an innovative surface treatment technology, can effectively improve fatigue life, surface hardness, corrosion resistance, and residual compressive stress. Compared with laser shock peening, warm laser shock peening (WLSP) is a newer surface treatment technology used to improve materials’ surface performances, which takes advantage of thermal mechanical effects on stress strengthening and microstructure strengthening, resulting in a more stable distribution of residual compressive stress under the heating and cyclic loading process. In this paper, the microstructure of the GH4169 nickel superalloy processed by WLSP technology with different laser parameters was investigated. The proliferation and tangling of dislocations in GH4169 were observed, and the dislocation density increased after WLSP treatment. The influences of different treatments by LSP and WLSP on the microhardness distribution of the surface and along the cross-sectional depth were investigated. The microstructure evolution of the GH4169 alloy being shocked with WLSP was studied by TEM. The effect of temperature on the stability of the high-temperature microstructure and properties of the GH4169 alloy shocked by WLSP was investigated.

Plastic Deformation in Silicon Crystal Induced by Heat-Assisted Laser Shock Peening

2008 ◽  
Vol 130 (1) ◽  
Author(s):  
Gary J. Cheng ◽  
M. Cai ◽  
Daniel Pirzada ◽  
Maxime J.-F. Guinel ◽  
M. Grant Norton
Keyword(s):  
Residual Stress ◽  
Plastic Deformation ◽  
Compressive Residual Stress ◽  
Silicon Crystal ◽  
Brittle Materials ◽  
Laser Shock Peening ◽  
Laser Shock ◽  
Electron Backscattered Diffraction ◽  
Transmission Electron ◽  
Shock Peening

The response of solid to shock compression has been an interesting topic for more than a century. The present work is the first attempt to experimentally show that plastic deformation can be generated in brittle materials by a heat-assisted laser shock peening process, using silicon crystal as a sample material. Strong dislocation activity and large compressive residual stress are induced by this process. The dislocation structure is characterized with transmission electron microscopy and electron backscattered diffraction. The residual stress is measured using Raman scattering. This work presents a fundamental base for the application of laser shock peening in brittle materials to generate large compressive residual stress and plastic deformation for better mechanical properties, such as fatigue life and fracture toughness.

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